Introduction

In this blog post, we will explore how to solve the LeetCode problem "1974" using AI. LeetCode is a popular platform for preparing for coding interviews, and with the help of AI tools like Chatmagic, we can generate solutions quickly and efficiently - helping you pass the interviews and get the job offer without having to study for months.

Problem Statement

There is a special typewriter with lowercase English letters 'a' to 'z' arranged in a circle with a pointer. A character can only be typed if the pointer is pointing to that character. The pointer is initially pointing to the character 'a'. Each second, you may perform one of the following operations: Move the pointer one character counterclockwise or clockwise. Type the character the pointer is currently on. Given a string word, return the minimum number of seconds to type out the characters in word. Example 1: Input: word = "abc" Output: 5 Explanation: The characters are printed as follows: - Type the character 'a' in 1 second since the pointer is initially on 'a'. - Move the pointer clockwise to 'b' in 1 second. - Type the character 'b' in 1 second. - Move the pointer clockwise to 'c' in 1 second. - Type the character 'c' in 1 second. Example 2: Input: word = "bza" Output: 7 Explanation: The characters are printed as follows: - Move the pointer clockwise to 'b' in 1 second. - Type the character 'b' in 1 second. - Move the pointer counterclockwise to 'z' in 2 seconds. - Type the character 'z' in 1 second. - Move the pointer clockwise to 'a' in 1 second. - Type the character 'a' in 1 second. Example 3: Input: word = "zjpc" Output: 34 Explanation: The characters are printed as follows: - Move the pointer counterclockwise to 'z' in 1 second. - Type the character 'z' in 1 second. - Move the pointer clockwise to 'j' in 10 seconds. - Type the character 'j' in 1 second. - Move the pointer clockwise to 'p' in 6 seconds. - Type the character 'p' in 1 second. - Move the pointer counterclockwise to 'c' in 13 seconds. - Type the character 'c' in 1 second. Constraints: 1 <= word.length <= 100 word consists of lowercase English letters.

Explanation

• Calculate Distance: For each character in the input word, determine the shortest distance to move the pointer from the current character to the target character. This involves considering both clockwise and counterclockwise movements.
  • Accumulate Time: Sum up the minimum movement time and the typing time (which is always 1 per character) to get the total time.
  • Iterate and Update: Iterate through the word, updating the current pointer position after each character is typed.

• Runtime Complexity: O(n), where n is the length of the word. Storage Complexity: O(1).

Code

    def min_time_to_type(word: str) -> int:
    """
    Calculates the minimum number of seconds to type out the characters in a word using a special typewriter.

    Args:
        word: The string to be typed.

    Returns:
        The minimum number of seconds required to type the word.
    """

    current_char = 'a'
    total_time = 0

    for target_char in word:
        diff = abs(ord(target_char) - ord(current_char))
        move_time = min(diff, 26 - diff)
        total_time += move_time + 1  # +1 for typing the character
        current_char = target_char

    return total_time